// Fig. 15.1: Stack.h
// Stack class template.
#pragma once
#include <deque>

template<typename T>
class Stack {
public:
   // return the top element of Stack
   const T& top() const {return stack.front();}

   // push an element onto Stack
   void push(const T& pushValue) {stack.push_front(pushValue);}

   // pop an element from Stack
   void pop() {stack.pop_front();}

   // determine whether Stack is empty
   bool isEmpty() const {return stack.empty();}

   // return size of Stack
   size_t size() const {return stack.size();}
private:
   std::deque<T> stack{}; // internal representation of Stack
}; 



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